Yeah, having now seen the "good" ending, I think a no-corruption ending might be a bit hard to design, but there's definitely some ways you could do it. You could have the character getting out of their pod and being exposed in their partially-ripped suit and embarrassed. You could have the character maybe dreaming/fantasizing about what could've happened if they'd gotten caught by the slime some more (and as a plus, since they didn't actually experience what it's like, their imagination would have a lot more creative liberties it could take. Like, what if the slime had tentacles? or maybe he's imagining what it'd be like if it morphed into a slime girl/futa?)
Making the current ending be the uncorrupted ending feels a bit off, especially considering the whole "sensitivity increasing" aspect of the slime as of the lore you had for it. But I imagine you're not all too stuck on the specifics of that. But it is shown in-game via the fact that the character only gets hard after being partially slimed. So it does make sense in my mind for the uncorrupted ending to be less hardcore. Hardcore isn't quite the right word, but you know what I mean.